capability: warning: `syz-executor.0' uses 32-bit capabilities (legacy support in use)
==================================================================
BUG: KMSAN: uninit-value in slab_alloc_node mm/slub.c:2749 [inline]
BUG: KMSAN: uninit-value in kmem_cache_alloc_node+0x5d0/0xe70 mm/slub.c:2828
CPU: 0 PID: 12417 Comm: syz-executor.0 Not tainted 5.3.0-rc3+ #16
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan_report.c:109
 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:294
 slab_alloc_node mm/slub.c:2749 [inline]
 kmem_cache_alloc_node+0x5d0/0xe70 mm/slub.c:2828
 __alloc_skb+0x215/0xa10 net/core/skbuff.c:197
 alloc_skb include/linux/skbuff.h:1056 [inline]
 __ip6_append_data+0x46ad/0x6060 net/ipv6/ip6_output.c:1514
 ip6_append_data+0x3c2/0x650 net/ipv6/ip6_output.c:1683
 udpv6_sendmsg+0x142d/0x4660 net/ipv6/udp.c:1485
 inet6_sendmsg+0x276/0x2e0 net/ipv6/af_inet6.c:576
 sock_sendmsg_nosec net/socket.c:637 [inline]
 sock_sendmsg net/socket.c:657 [inline]
 kernel_sendmsg+0x24a/0x440 net/socket.c:677
 sock_no_sendpage+0x205/0x2b0 net/core/sock.c:2721
 kernel_sendpage net/socket.c:3682 [inline]
 sock_sendpage+0x1f1/0x2e0 net/socket.c:935
 pipe_to_sendpage+0x342/0x470 fs/splice.c:449
 splice_from_pipe_feed fs/splice.c:500 [inline]
 __splice_from_pipe+0x484/0xe80 fs/splice.c:624
 splice_from_pipe fs/splice.c:659 [inline]
 generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:829
 do_splice_from fs/splice.c:848 [inline]
 direct_splice_actor+0x19e/0x200 fs/splice.c:1020
 splice_direct_to_actor+0x852/0x1130 fs/splice.c:975
 do_splice_direct+0x342/0x580 fs/splice.c:1063
 do_sendfile+0x1010/0x1d20 fs/read_write.c:1464
 __do_sys_sendfile64 fs/read_write.c:1525 [inline]
 __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1511
 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1511
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x459829
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f6d2bbbbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459829
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008001 R11: 0000000000000246 R12: 00007f6d2bbbc6d4
R13: 00000000004c6ff7 R14: 00000000004dc558 R15: 00000000ffffffff

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:187 [inline]
 kmsan_internal_chain_origin+0xcc/0x150 mm/kmsan/kmsan.c:345
 __msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:190
 ___slab_alloc+0x1dbc/0x1fb0 mm/slub.c:2634
 __slab_alloc mm/slub.c:2687 [inline]
 slab_alloc_node mm/slub.c:2750 [inline]
 kmem_cache_alloc_node+0x769/0xe70 mm/slub.c:2828
 __alloc_skb+0x215/0xa10 net/core/skbuff.c:197
 alloc_skb include/linux/skbuff.h:1056 [inline]
 __ip6_append_data+0x46ad/0x6060 net/ipv6/ip6_output.c:1514
 ip6_append_data+0x3c2/0x650 net/ipv6/ip6_output.c:1683
 udpv6_sendmsg+0x142d/0x4660 net/ipv6/udp.c:1485
 inet6_sendmsg+0x276/0x2e0 net/ipv6/af_inet6.c:576
 sock_sendmsg_nosec net/socket.c:637 [inline]
 sock_sendmsg net/socket.c:657 [inline]
 kernel_sendmsg+0x24a/0x440 net/socket.c:677
 sock_no_sendpage+0x205/0x2b0 net/core/sock.c:2721
 kernel_sendpage net/socket.c:3682 [inline]
 sock_sendpage+0x1f1/0x2e0 net/socket.c:935
 pipe_to_sendpage+0x342/0x470 fs/splice.c:449
 splice_from_pipe_feed fs/splice.c:500 [inline]
 __splice_from_pipe+0x484/0xe80 fs/splice.c:624
 splice_from_pipe fs/splice.c:659 [inline]
 generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:829
 do_splice_from fs/splice.c:848 [inline]
 direct_splice_actor+0x19e/0x200 fs/splice.c:1020
 splice_direct_to_actor+0x852/0x1130 fs/splice.c:975
 do_splice_direct+0x342/0x580 fs/splice.c:1063
 do_sendfile+0x1010/0x1d20 fs/read_write.c:1464
 __do_sys_sendfile64 fs/read_write.c:1525 [inline]
 __se_sys_sendfile64+0x2bb/0x360 fs/read_write.c:1511
 __x64_sys_sendfile64+0x56/0x70 fs/read_write.c:1511
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:187 [inline]
 kmsan_internal_poison_shadow+0x53/0xa0 mm/kmsan/kmsan.c:146
 kmsan_slab_free+0x8d/0x100 mm/kmsan/kmsan_hooks.c:195
 slab_free_freelist_hook mm/slub.c:1472 [inline]
 slab_free mm/slub.c:3038 [inline]
 kmem_cache_free_bulk+0x3ad9/0x3f50 mm/slub.c:3163
 __kfree_skb_flush+0xb0/0x100 net/core/skbuff.c:862
 net_rx_action+0x1908/0x1950 net/core/dev.c:6436
 __do_softirq+0x4a1/0x83a kernel/softirq.c:293
 invoke_softirq kernel/softirq.c:375 [inline]
 irq_exit+0x230/0x280 kernel/softirq.c:416
 exiting_irq arch/x86/include/asm/apic.h:537 [inline]
 do_IRQ+0x20d/0x3a0 arch/x86/kernel/irq.c:259
 ret_from_intr+0x0/0x33
 native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
 arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
 kmsan_slab_alloc+0xd5/0x120 mm/kmsan/kmsan_hooks.c:178
 slab_alloc_node mm/slub.c:2790 [inline]
 kmem_cache_alloc_node+0x8f8/0xe70 mm/slub.c:2828
 __alloc_skb+0x215/0xa10 net/core/skbuff.c:197
 alloc_skb include/linux/skbuff.h:1056 [inline]
 __tcp_send_ack+0xfb/0x840 net/ipv4/tcp_output.c:3660
 tcp_send_ack+0x68/0x90 net/ipv4/tcp_output.c:3687
 tcp_cleanup_rbuf+0x764/0x800 net/ipv4/tcp.c:1562
 tcp_recvmsg+0x334d/0x4ff0 net/ipv4/tcp.c:2166
 inet_recvmsg+0x237/0x7d0 net/ipv4/af_inet.c:838
 sock_recvmsg_nosec net/socket.c:871 [inline]
 sock_recvmsg net/socket.c:889 [inline]
 sock_read_iter+0x5be/0x660 net/socket.c:967
 call_read_iter include/linux/fs.h:1864 [inline]
 new_sync_read fs/read_write.c:414 [inline]
 __vfs_read+0xa67/0xc90 fs/read_write.c:427
 vfs_read+0x359/0x6f0 fs/read_write.c:461
 ksys_read+0x265/0x430 fs/read_write.c:587
 __do_sys_read fs/read_write.c:597 [inline]
 __se_sys_read+0x92/0xb0 fs/read_write.c:595
 __x64_sys_read+0x4a/0x70 fs/read_write.c:595
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================